Velvetleaf is regarded as the world's worst cropping weed, damaging arable crops, lowering crop yield by competing with them for nutrients, space and water.
Velvetleaf seedlings are vigorous and the plant grows rapidly in the first few months after germination. Seeds remain viable for up to 60 years. A member of the mallow family, it is already present in New Zealand, including in the Waikato region. A national outbreak in 2016 was linked to imported fodder beet seed infested with velvetleaf.
However, Waikato incursions have also been linked to the movement of infested maize crops and maize silage, unclean machinery and stock which has eaten infested feed. The seed survives in maize silage and in the gut of cattle for up to a week. Farm, crop and machinery hygiene are important strategies for the prevention and control of this pest.
When the plant has seeded,placing a large bag over the seed capsules and flowers to help prevent spreading is essential and should be kept away from machinery and animals.
The council also recommend herbicides to spray on small seedlings.
If you suspect you have velvetleaf on your property, contact the Waikato Regional Council pest plant staff on 0800 BIOSEC (0800 246 732). More information on the website: www.waikatoregion.govt.nz/velvetleaf
